TIRE BUILDING DRUM

A tire building drum. A synchronous drive assembly in a case drives a first push-pull rod inside a drum shaft and a second push-pull rod outside the drum shaft to move synchronously; the first push-pull rod drives a first turn-up rod mechanism and the second push-pull rod drives a second turn-up rod mechanism, achieving synchronous expansion and contraction of the first turn-up rod mechanism and the second turn-up rod mechanism, thus realizing turn-up expansion and contraction, and the first push-pull rod and the second push-pull rod respectively have rod-shaped structures; the structure is simple, the manufacturing cost is low, the structural strength and rigidity are high, control is convenient, push-pull precision and stability are improved, the integration level of the synchronous drive assembly is high, the overall size of the case can be reduced, the second push-pull rod is located outside of the drum shaft, the complexity of the internal structure of the drum shaft is reduced, maintenance is convenient